THERMOMETER

THERMOMETER

1Thermometeran instrument for measuring and indicating temperature, typically one consisting of a narrow, hermetically sealed glass tube marked with graduations and having at one end a bulb containing mercury or alcohol that expands and contracts in the tube with heating and cooling.

Types of ThermometerTraditional Thermometers (Spirit Filled)Spirit level indicationEasy to read, typically measuring in both C and FCan often be wall mounted or submerged in liquidsThey require very little maintenanceVariable measurement range, resolution and accuracy

Dual Sensor / Multiple Sensor ThermometersTypically consist of display unit and external temperature sensorsEach external sensor reading is displayed on the main unitThe main unit can typically be wall or desk mountedTraceable accuracy is recommendedVariable measurement range, resolution and accuracyIrreversible Temperature LabelsEach foil segment on a label is sensitive to a different temperature and when exposed to its rating will turn blackEach segment has both C and F temperature valuesEach label is oil and water resistantThe colour change is irreversible even after the object being measured cools downAfter use, labels can be removedVariable measurement range, resolution and accuracy

Fixed & Wired Probe ThermometersVery easy to use and highly portableProbes will vary in size, material, and manoeuvrabilityWired probe thermometers are similar to fixed probe thermometers, the difference being that the probe is attached to the thermometer via a wire. This maximises utility without compromising accuracyTraceable accuracy is recommended if used in a professional environmentVariable measurement range, resolution and accuracy

K-Type ThermometersThey offer wide temperature measurement ranges, high accuracy, and fast measurement response timesNon-slip function buttons and impact-resistant casing make these thermometers ideal for use in harsh working environmentsProbes will vary in size, material, and manoeuvrabilityTraceable accuracy is recommended if used in a professional environmentVariable measurement range, resolution and accuracy

Data Logging ThermometersThe recorded measurements can be attached to emails or reports, and is great for fault finding or traceability in controlled environmentsA user may select the logging rate, start time, alarm limits, and logging modeThe supplied analysis software provides a graphical display of data, showcasing the total readings, a zoom facility for individual readings, and a visual indication of alarm levels throughout the logging periodTraceable accuracy is recommended if used in a professional environmentVariable measurement range, resolution and accuracy

Infrared ThermometersImportant factors to consider before measuring are laser spot-size, and the emissivity value of the surface being measuredThe error in the accuracy of a measured value can be as much as 30% of the reading just based on emissivityTraceable accuracy is recommended if used in a professional environmentVariable measurement range, resolution and accuracy

Thermal Imaging CamerasSome cameras facilitate the download of imagery to PCs or Laptop computers. The recorded data can then be attached to emails or reports, and is great for fault finding or traceability in controlled environmentsVariable image display resolutionSome models include a correction for emissivity and reflected temperatureVariable measurement range, resolution and accuracy

PARTS AND FUNCTION

BulbA mercury thermometer takes advantage of liquids' expansion when the temperature increases.CapillaryThe capillary of a mercury thermometer is the long cylindrical tube that is connected to the bulb.Expansion ChamberThe expansion chamber of a mercury thermometer can be found at the top of the capillary. The function of the expansion chamber is to form a larger volume through which the mercury can fill if the maximum temperature scale is exceeded.ScaleThe scale is the series of lines that are etched into an area to the side of the capillary.

PREVENTIVE MAINTAINANCE

Regardless of the type of thermometer you choose to use, it is important to follow the instructions enclosed with the packet upon purchase for optimal results and product longevity. For regular digital thermometers and alcohol-filled thermometers, be sure to sterilize the tip with rubbing alcohol, or wash well with warm water and soap after each use. For ear or tympanic thermometers, it may be helpful to invest in some disposable caps that can be tossed after each use. Store all thermometers with the rest of your first aid supply, and keep away from children and infants for their safety as thermometers are not toys.